Thermal Analysis of Polymers

Chartoff, Richard P.; Sircar, A. K.

doi:10.1002/0471440264.pst367

Cited by 21 publications

(16 citation statements)

References 85 publications

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“…The second fall in G′ is observed between 45 °C and 75 °C, which shows a loss in the stiffness of TPS pine resin derivatives [ 54 ], as the materials reach their glass transition temperature. After this fall, the storage modulus of the TPS-pine resin derivatives formulations equals the storage modulus of neat TPS, which suggests that pine resin derivatives lose their rigidity due to the temperature.…”

Section: Resultsmentioning

confidence: 99%

Films Based on Thermoplastic Starch Blended with Pine Resin Derivatives for Food Packaging

Pavón

Aldás

López‐Martínez

et al. 2021

Foods

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Completely biobased and biodegradable thermoplastic starch (TPS) based materials with a tunable performance were prepared for food packaging applications. Five blends were prepared by blending TPS with 10 wt%. of different pine resins derivatives: gum rosin (GR), disproportionated gum rosin (RD), maleic anhydride-modified gum rosin (CM), pentaerythritol ester of gum rosin (LF), and glycerol ester of gum rosin (UG). The materials were characterized in terms of thermo-mechanical behavior, surface wettability, color performance, water absorption, X-ray diffraction pattern, and disintegration under composting conditions. It was determined that pine resin derivatives increase the hydrophobicity of TPS and also increase the elastic component of TPS which stiffen the TPS structure. The water uptake study revealed that GR and LF were able to decrease the water absorption of TPS, while the rest of the resins kept the water uptake ability. X-ray diffraction analyses revealed that GR, CM, and RD restrain the aging of TPS after 24 months of aging. Finally, all TPS-resin blends were disintegrated under composting conditions during the thermophilic incubation period (90 days). Because of the TPS-resin blend’s performance, the prepared materials are suitable for biodegradable rigid food packaging applications.

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Section: Resultsmentioning

confidence: 99%

Films Based on Thermoplastic Starch Blended with Pine Resin Derivatives for Food Packaging

Pavón

Aldás

López‐Martínez

et al. 2021

Foods

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show abstract

“…TGA is often carried out in a well-controlled atmosphere such as a vacuum or an inert gas filled environment to control the nature of the thermal decomposition by preventing oxidation. The measurements can be presented in plots that are either temperature-dependent or time-dependent where changes in mass can usually be attributed to material volatility or degradation . Assessing the thermal stability of polymers is the predominant application of TGA.…”

Section: Polymer Strandsmentioning

confidence: 99%

“…The measurements can be presented in plots that are either temperature-dependent or time-dependent where changes in mass can usually be attributed to material volatility or degradation. 97 Assessing the thermal stability of polymers is the predominant application of TGA. These data are especially valuable for polymer strands before or after formation of the network as they provide a temperature range in which the material can ultimately operate.…”

Section: Physical Properties Analysismentioning

confidence: 99%

Molecular Characterization of Polymer Networks

et al. 2021

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Polymer networks are complex systems consisting of molecular components. Whereas the properties of the individual components are typically well understood by most chemists, translating that chemical insight into polymer networks themselves is limited by the statistical and poorly defined nature of network structures. As a result, it is challenging, if not currently impossible, to extrapolate from the molecular behavior of components to the full range of performance and properties of the entire polymer network. Polymer networks therefore present an unrealized, important, and interdisciplinary opportunity to exert molecular-level, chemical control on material macroscopic properties. A barrier to sophisticated molecular approaches to polymer networks is that the techniques for characterizing the molecular structure of networks are often unfamiliar to many scientists. Here, we present a critical overview of the current characterization techniques available to understand the relation between the molecular properties and the resulting performance and behavior of polymer networks, in the absence of added fillers. We highlight the methods available to characterize the chemistry and molecular-level properties of individual polymer strands and junctions, the gelation process by which strands form networks, the structure of the resulting network, and the dynamics and mechanics of the final material. The purpose is not to serve as a detailed manual for conducting these measurements but rather to unify the underlying principles, point out remaining challenges, and provide a concise overview by which chemists can plan characterization strategies that suit their research objectives. Because polymer networks cannot often be sufficiently characterized with a single method, strategic combinations of multiple techniques are typically required for their molecular characterization.

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“…30 in [18]). Thermogravimetry, another experimental method suitable for detecting the amorphous gel-like phase in terms of time-temperature measurements, is used convincingly for uncovered membrane structure examination in [18].…”

Section: Nonconservative Model System Beyond the Low Thermal Energy Rmentioning

confidence: 99%

Temperature dependent volume expansion of microgel in nonequilibria

2018

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We propose to adopt a non-isothermal and colloid type cluster-cluster aggregation stochastic model aimed at comprehending the temperature driven and polymer swelling accompanying volume expansion encountered in microgels. The nonequilibrium nature of the process is captured by describing expansion characteristics with simplified power laws, indicating the scalability of properties with time and temperature. Additionally, molecular dynamics simulations of the presented mechanism for a chosen biopolymer have been performed. This can be of interest for experimenters working in the field of nonequilibrium phase transitions, and fairly prospectively, within the area of thermal phonon-involving technology. In these areas, scanning the system's temperature, or sometimes tuning similar dissipation-addressing physical factors, such as pH, appears to be a fairly pivotal examination case.

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Thermal Analysis of Polymers

Cited by 21 publications

References 85 publications

Films Based on Thermoplastic Starch Blended with Pine Resin Derivatives for Food Packaging

Films Based on Thermoplastic Starch Blended with Pine Resin Derivatives for Food Packaging

Molecular Characterization of Polymer Networks

Temperature dependent volume expansion of microgel in nonequilibria

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